Miata Mailing List: November 1993, Message #192
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   From: hazmat@motor.arl.army.mil (Matt Bennett)
Subject: Re: Door Dings
   Date: Mon, 22 Nov 1993 17:10:40 -0500

Instead of heating, then cooling, I have heard of a procedure that removes
hail dings using dry ice to cool, which causes the metal to contract, removing
the ding.  I seem to recall a thread on this subject 6 or 8 months back
that one of these paintless dent removal techniques was to use what looked like 
a burnisher, or some other hard smooth metal rod, insert it into the body 
panel via a drain hole or a hole drilled in an unobtrusive place, and
rub it out from the inside.  

Using a suction cup may not be perfect, but the only minus I have found is that
it may not remove all of the dent, just most of it.  I have used my suction
cup a number of times to remove dents, and it has reduced the damage without
causing any more damage each time.  The biggest danger I can see is pushing
the suction cup on too hard, thereby causing a bigger dent.  That is why
I suggested cleaning the area first, then using a bit of water to make
a good seal for the vacum.

Matt